Iran has faced with water scarcity problem for a long time. There is a strong tendency to desalinate seawater from Oman or the Caspian Sea as intake seawater and transfer it to central parts of the country. These projects face significant technical, economic, and environmental challenges. In this work, utilizing available economic theories about single-stage reverse osmosis (RO) desalination plants, the cost analysis of a conceptual plant with a production capacity of 200,000 m³/day, was accomplished assuming the use of Oman and Caspian seawater as feed. The effect of important parameters such as applied pressure, recovery ratio, total salt content of the feed, and produced water and the temperature has been studied theoretically. The results show that under the same working conditions, the final product price per cubic meter of freshwater from the Caspian Sea is $ 0.69 versus $ 1.24 for the Oman Sea, which is about 50% cheaper. The lower salinity of the Caspian Sea compared to the Oman Sea is the main reason, which lead to reduce in the capital cost of the RO membrane (62% difference), cost of the intake and pretreatment (20%), and cost of membrane elements replacement (13%) regardless of water transfer cost.

伊朗长期面临缺水问题。淡化来自阿曼或里海的海水作为进口海水并将其转移到该国中部地区的趋势很明显。这些项目面临重大的技术，经济和环境挑战。在这项工作中，利用有关单级反渗透（RO）海水淡化厂的可用经济理论，对产能为200,000 m ³的概念厂进行成本分析假设使用阿曼和里海海水作为饲料，则每天可以完成。从理论上研究了重要参数的影响，例如施加压力，回收率，饲料总盐含量，采出水和温度。结果显示，在相同的工作条件下，里海每立方米淡水的最终产品价格为0.69美元，而阿曼海为1.24美元，便宜了约50％。主要原因是里海盐度低于阿曼海，这导致反渗透膜的资本成本（相差62％），进水和预处理的成本（20％）以及膜的成本降低。元素的更换（13％），无论输水成本如何。